Data update

Task/Musical-scale/Pluto/musical-scale.pluto

@@ -0,0 +1,18 @@
+local audio = require "audio"
+require "table2"
+
+local sample_rate = 44100
+local duration = 8
+local data = table.rep(sample_rate * duration, 0)
+local freqs = {261.6, 293.6, 329.6, 349.2, 392.0, 440.0, 493.9, 523.3}
+for j = 0, duration - 1 do
+    local freq = freqs[j + 1]
+    local omega = 2 * math.pi * freq
+    for i = 0, sample_rate - 1 do
+        local y = math.round(32 * math.sin(omega * i / sample_rate)) & 255
+        data[i + j * sample_rate + 1] = y
+    end
+end
+local filepath = "musical_scale.wav"
+audio.create(filepath, data, sample_rate)
+audio.play(filepath)